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From "Krishnaraj (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-503) Implement erasure coding as a layer on HDFS
Date Fri, 03 Jun 2011 04:53:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13043213#comment-13043213
] 

Krishnaraj commented on HDFS-503:
---------------------------------

I got this patch and I took the HDFS from http://svn.apache.org/repos/asf/hadoop/hdfs/trunk/
and put it in contrib and built it. But I din know how to use it further(ie instead of the
hadoop jar that we setup in the cluster. I did not get the jar as mentioned in README). Is
there any detailed tutorial?


> Implement erasure coding as a layer on HDFS
> -------------------------------------------
>
>                 Key: HDFS-503
>                 URL: https://issues.apache.org/jira/browse/HDFS-503
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: contrib/raid
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.21.0
>
>         Attachments: raid1.txt, raid2.txt
>
>
> The goal of this JIRA is to discuss how the cost of raw storage for a HDFS file system
can be reduced. Keeping three copies of the same data is very costly, especially when the
size of storage is huge. One idea is to reduce the replication factor and do erasure coding
of a set of blocks so that the over probability of failure of a block remains the same as
before.
> Many forms of error-correcting codes are available, see http://en.wikipedia.org/wiki/Erasure_code.
Also, recent research from CMU has described DiskReduce https://opencirrus.org/system/files/Gibson-OpenCirrus-June9-09.ppt.
> My opinion is to discuss implementation strategies that are not part of base HDFS, but
is a layer on top of HDFS.

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